<!DOCTYPE html>
<body style="margin: 100px">
    <div id="outer" style="box-shadow: 40px -40px #F00;">
        <div id="inner1" style="height: 100px; background-color: blue"></div>
        <div id="inner2" style="height: 100px; background-color: green"></div>
    </div>
</body>
